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Author Topic: Avalon 741 Overclock possible?  (Read 350 times)
DinosaurBit
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November 14, 2017, 03:26:25 PM
 #1

Hi there,

So a friend told me his friend (I know this makes a lot of friends) was able to overclock an Avalon 741 to 10 Th/s.

Is that possible at all? Been looking around for a procedure to achieve this but couldn't find anything...

I don't have enough knowledge regarding this specific ASIC to tell if it's the truth or not, so I'd like to have your opinion on this.

Thanks!
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wavelengthsf
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November 14, 2017, 03:30:17 PM
 #2

Hi there,

So a friend told me his friend (I know this makes a lot of friends) was able to overclock an Avalon 741 to 10 Th/s.

Is that possible at all? Been looking around for a procedure to achieve this but couldn't find anything...

I don't have enough knowledge regarding this specific ASIC to tell if it's the truth or not, so I'd like to have your opinion on this.

Thanks!

Set the voltage offset to +1 in the miner settings.

However, this will increase the power draw and decrease the reliability of the unit so make sure you have adequate power (ie: greater than 1200watts) and cooling.  
DinosaurBit
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November 14, 2017, 03:34:33 PM
 #3

Thanks for your follow-up!

PSU can take up to 1600W, so shouldn't be an issue.

What would you recommend for cooling?
wavelengthsf
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November 14, 2017, 04:02:06 PM
 #4

Thanks for your follow-up!

PSU can take up to 1600W, so shouldn't be an issue.

What would you recommend for cooling?

I don't overclock my avalons, so I'm not sure how hot it gets when running at this offset - but I'd want to keep the ambient temp as low as possible and make sure the machine is running as cool as it can be.
fanatic26
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November 14, 2017, 07:29:09 PM
 #5

No overclock will make them run at 10th reliably. Someone is full of crap.

Also with the Avalon being the least efficient 16/14nm miner, overclocking it and taking it even further out of its efficiency range is a terrible idea.

Stop buying industrial miners, running them at home, and then complaining about the noise.
Thetaj
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November 15, 2017, 06:31:58 AM
 #6

All I'm willing to say is that each 741s aren't created equal. Some of them will run at amazing speeds while others are just a little bit better than toasters. What Canaan does garuntee is 7.3th @ 0 offset. (which is pretty damn easy to achieve).

I do I have some avalons running at 9.5th@ +1 offset. But the power draw makes it less efficient than running at -2 and getting 7.5
ConnerM
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November 15, 2017, 07:28:17 AM
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No overclock will make them run at 10th reliably. Someone is full of crap.
Also with the Avalon being the least efficient 16/14nm miner, overclocking it and taking it even further out of its efficiency range is a terrible idea.

I agree.

We get a nice range between 7.9 and 8.1 from our (Cool 741's at '0', and about 8.1 to 8.4 at '+1'.

Temps run 28-31 and 86-91 at '+1'. This is with 50 degree ambient air coming in.

Amperage draw per bank of (4) units is around 24amps (208v) at '0' and 27-28amps (208v) at '+1' so they do loose a margin of efficiency when they are overclocked. Almost certainly overclocking shortens the MTBF life of the units, but I could not say how much. Not really worth doing IMO.

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DinosaurBit
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November 15, 2017, 08:42:27 PM
 #8

Thanks for your feedback guys, much appreciated!
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